While resistance checking is good to see if a wire is broken or not, it is my opinion that you are not going to see any benefit with a lower resistance wire. Get the one that is the most durable.
I'm inclined to agree with Magnecor.
http://www.magnecor.com/magnecor1/truth.htm
Testing with a DC ohmmeter that's powered by less than 9 volts (mine uses 4 aa batteries) is certainly going to have different electrical characteristics than testing at 40,000 volts of spark arc.
And remember, your spark is jumping an air gap. Which has, oh, let's say for argument's sake 10,000,000 (10 megohms) resistance, even though in reality it's much higher (test the air gap with your DC ohmmeter
).
Difference between 10,000,000.1 and 10,000,500? Really pretty insignificant in the big picture.
That's why I don't buy in to claims of any power increase with plug wires. At all. Replacing bad wires will result in a power increase (duh) because you're fixing misfires.
I check my wires for continuity with my ohmmeter, but I do not rate performance of a wire based on the resistance.